Adjustable v-type pulley



April 7, 1936. c, TORKELSON 2,036,445

ADJUSTABLE V-TYPE PULLEY Filed Feb. 12, 1954 2, Sheets-Sheet 1 Hank C. firke/so I Patented Apr. 7, 1936 UNITED STATES PATENT OFFICE ADJUSTABLE V-TYPE PULLEY Frank C. Torkelson, Salt Lake City, Utah Application February 12, 1934, Serial No. 710,833

1 Claim. (01. 14-23011) My invention relates to pulley wheels and has 1 having a drum 2 formed at right angles thereto for its object to provide a new and efficient and parallel to the hub A. This drum 2 has a unit construction adjustable multiple pulley flange 3 formed on one end thereof and has the wheel. other end provided with cut away section 4 in A further object is to provide a unit construcwhich sliding lugs 5 of a sleeve 6 are carried 5 tion adjustable pulley wheel which may be used The sleeve 6 surrounds the drum 2 with a porto take up slack in V-type belts when they tion thereof, and the free end of the sleeve is have become stretched through use. provided with a flange l thereon equal in di- A still further object is to provide a unit conameter to the flange 3. Bolts 8 are passed 10 structed adjustable pulley wheel which is adaptthrough holes in the flange web I and through 10 ed for use on fixed centers and which may be holes in the lugs 5 to provide means for securadjusted to the belt to take up slack in the ing the drum and sl v th and f r adbelt without the use of exterior means. justment thereof. When the two members are A still further object is to provide a multiple secured together they form a completed drum pulley on which various sized belts may be used as shown in Figure 3 of the drawings. In this 15 with equal efficiency. view the drum is extended to encompass the These objects I accomplish with the device 11- rings in their greatest separation for use with lustratedin the accompanying drawings in which the largest type of belts or for use when small similar numerals and letters of reference inditype b lts are u ed and the bel is short. This cate like parts throughout the several views and drum as shown in igure 3 is alike n Position as described in the specification forming a part to that shown in Fi e 1 w ere the various of this application and pointed out in the aprin s a e ld t r n and spac d apart by the pended claim. a wire ring spacer D. Each of the outside rings E In the drawings are used to make the grooves therebetween and Figure 1 is a vertical section diametrically are formed with step cuts l0 therein to fit over 25 through the pulley with metallic rings in place t e fl s 3 a d 6 of t e eeve and drumto show the grooves extended to the fullest lime inside rings F h v the Side Walls ll Da its. allel and at right angles to the bore l2. The Figure 2 is an end view of Figure 1. bore l2 of all of the rings is equal to the outside Figure 3 is a view of the outside of the hub diameter of the sleeve 6 to fit thereon. The in- 30 and sleeve with the rings removed, side faces of the walls of the outside rings E and Figure 4 is a face view of one of the rings to both side faces of the rings F are provided with show the annular spacer ring groove therein. a a Concave gTOOVBS and different S ed Figure 5 is a. face view of a section of the admetallic or semi-circular wire rings l5 may be justment rings. placed therein to space the rings apart as de- 35 Figure 6 is a diametrical section of the pulley si d. T us any typ of wi may f rm d of the annular diameter type shown fully exinto a ring and set into the annular grooves to tended to either use a wide belt or to produ e space the rings apart. The rings E and F have the smallest pitch diameter for use with a small the ut r p s l3 thereof tapered t d the or short belt. outer perimeter and when they are all set to- 40 Figure 7 is a side elevation of Figure 6. gether on the sleeve and hub they form the Figure 8 is a face view of one of the tape annular grooves l1 therebetween in which the up adjusting rings used in the small pulley. belts ride.

Figure 9 is a side view of Figure 8. When no wire rings are used then, the rings Figure 10 is a face view of the groove rings E and F abut and form V-shaped grooves there- 45 used in the smaller pulley showing the annular between, and the pulley is in the narrowest pogroove therein and the steps in the bottom of sition. The wire rings used in this type of de-- the groove. vice are preferably made semicircular or in seg- Figure 11 is a side elevation of the pulley ments of a circle to enable changing the pitch wheel closed to the largest pitch diameter. diameters of the pulleys without entirely dis- 50 In the drawings I have shown the pulley sembling the pulley. In this form the rings wheel as made with cylindrical hub portion A, may be removed and inserted in sections from having a bore B therethrough inwhich the shaft either side without removing the bolts 8. is placed and secured by suitable means. Ex- In Figures 6, 7, 8, 9 and 10 of the drawings tending from said hub A, I then provide a web I have shown the modified form of wheel as 55 made with a cylindrical hub portion 2| adapted to fit onto thestub shaft of a motor or other stub shafts and having external threads 22 formed on the exterior thereof onto which threads an adjusting sleeve 23 is screwed. The hub 2| and the sleeve 23 are each provided with flanges 24 and 25 respectively on the outer ends thereof and a step 26 is formed on the hub 2| adjacent the flange 24 equal in diameter to the diameter of the outer perimeter of the sleeve 23. Thus, when the sleeve and hub are screwed together they form a smooth exterior of equal diameter with the flanges on each end thereof. Surrounding this sleeve and huh I then provide the groove rings 28, 29, 30 and 3|. These rings are formed with equal inner diameters to flt onto the sleeve 23 and the step 26 of the hub 2|. The outer portions of the rings are tapered toward the outer perimeter and when together on the hub and sleeve form annular rings with annular grooves therebetween, the grooves being V-shaped when the rings are set touching each other as shown in Figure 10 of the drawings. The rings are made with the inner bore parallel and equal diameters and with short parallel side walls 32 extending up from the bore thereof with the tapered portions 33 extending out from the parallel side walls. In cross section, the portions 33 are tapered to a point with the apex cut away to leave a fiat surface 34 therearound. The rings may be all made identical for purposes of manufacture and each side of each ring is provided with an annular groove 35 cut therein in the side walls 32 thereof. This groove is made with various depths therein each depth being adjusted to the next depth with a step vertical to the bottom of the groove. As shown in Figure 9 these grooves are made with four different depths therein. The grooves are then provided with adjustable spacer rings 3! formed annular to fit the inner and outer perimeter of the side walls of the grooves but with the faces of the rings formed identical to the bottom faces of the grooves. Each ring has preferably four different widths, the widest portions 38 and 39 to fit into the two deepest portions of the grooves. The next widest sections 40 and 4! to fit into the like sections of the grooves. The next widest sections 42 and 43 to fit in the like sections in the grooves and the thinnest sections 44 and 45 to fit in the shallowest sections of the grooves. This fitting of the rings into the grooves is the adjustable feature of this type of pulley and as described above with the like portions or sections of the rings fitting in the like depths of the grooves the pulleys are in the closed position as shown in Figure 10. The pulleys and grooves are formed with these various dimensions so that when in the closed position the narrowest sections 44 and 45 of the rings fit into the narrowest or shallowest sections of the grooves so that the space will be completely filled and likewise the other portions of the rings fit the like portions of the grooves and when extended to the fullest extent the thickest sections of the rings will fit into the smallest or shallowest grooves to space the rings as far apart as possible. In both the rings and grooves each section of like depth or like dimension is spaced diametrically opposite to each other.

Having thus described my invention I desire to secure by Letters Patent and claim:

In an adjustable pulley of the class described the combination of a hub; a web extending from said hub; a drum formed around said web having one end of said drum provided with a flange extending therearound of greater diameter than the drum; a sleeve carried over said drum havings its perimeter smaller than the flange of the drum and having its outer end provided with a flange of equal diameter to that of the flange on said drum; inwardly extended lugs formed on said sleeve; bolts passed through said lugs and through the web of said hub to adjustably hold the sleeve and drum in fixed relation to each other; annular ring members, frusto-conical in cross section, carried on said sleeve and drum the outer of said members to fit against said flanges and the adjacent edges of all ring members formed with annular grooves therein; and half circular spacer members to be placed in said annular grooves to space the ring apart as desired, said spacer members to be removable by loosening the bolts sufficient to allow them freedom from said annular grooves to be replaced by other sized spacer members when desired to adjust said pulley.

FRANK C. TORKELSON. 

